罗布莎豆荚状铬铁矿床中刚玉的含Ti矿物包裹体特征

徐向珍; 杨经绥; 熊发挥; 郭国林

doi:10.3799/dqkx.2018.706

罗布莎豆荚状铬铁矿床中刚玉的含Ti矿物包裹体特征

doi: 10.3799/dqkx.2018.706

1.
地幔研究中心, 国土资源部深地动力学重点实验室, 中国地质科学院地质研究所, 北京 100037
2.
东华理工大学核资源与环境省部共建国家重点实验室培育基地, 江西南昌 330013

基金项目:

国家自然科学基金项目 41672046

国家自然科学基金项目 41720104009

中国地质调查局工作项目 DD20160023-01

国家自然科学基金项目 41373029

详细信息

作者简介:
徐向珍(1980-), 女, 副研究员, 主要从事地幔矿物

中图分类号: P575
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出版历程
- 收稿日期: 2017-12-18
- 刊出日期: 2018-04-15

Characteristics of Titanium-Bearing Inclusions Found in Corundum of Luobusa Podiform Chromitite, Tibet

1.
Center for Advanced Research on Mantle(CARMA), Key Laboratory of Deep-Earth Dynamics of Ministry of Land and Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China

摘要

摘要: 通过能谱和电子探针分析了西藏罗布莎豆荚状铬铁矿石刚玉中的含钛合金和含钛氧化物包裹体特征，分析发现刚玉中含Ti合金矿物包裹体主要有Ti-N、Ti-B、Ti-C、Ti-Si-P和Ti-Si-Fe以及Ti-Al-Zr氧化物.Ti-N合金呈磨圆状、梅花状，粒度约17 μm×35 μm；Ti-B合金呈长柱状，10 μm×58 μm；Ti-C合金呈自形、他形，粒度约40 μm×50 μm；Ti-Si-P和Ti-Si-Fe合金成分不均一，呈一个熔融体包裹在刚玉中；Ti-Al-Zr氧化物成分纯净.结合铬铁矿石中发现大量的微粒金刚石和碳硅石等超高压异常地幔矿物，提出罗布莎铬铁矿石中的刚玉及其中的特殊矿物包裹体组合形成于高压环境的深部地幔.
- 矿物包裹体 /
- 刚玉 /
- 铬铁矿 /
- 罗布莎 /
- 西藏
Abstract: The titanium-bearing alloy and titanium-bearing oxide inclusions in corundum collected from Luobusa podiform chromitite in Tibet are studied. The EDS and EPMA analyses show that the Ti-N alloys are rounded or forming a quincunx with the size of 17 μm×35 μm; the Ti-B alloys are long columnar in size of 10 μm×58 μm; the authigenic and exnotopic Ti-C alloys are 40 μm×50 μm; the Ti-Si-P and Ti-Si-Fe alloys occur as highly heterogeneous melt in the corundum and the Ti-Al-Zr oxides are pretty pure in composition. Considering the unusual ultra-high pressure mantle mineral groups like diamond and moissanite recovered from the Luobusa chromitite, it is suggested that the corundum and its special mineral inclusions might form at the high-pressure deep mantle environment.
- mineral inclusion /
- corundum /
- chromitite /
- Luobusa /
- Tibet

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图 1 西藏罗布莎豆荚状铬铁矿床地质简图

据Zhou et al.(1996)修改

Fig. 1. Simplified geological map of Luobusa chromite deposit in Tibet

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图 2 康金拉铬铁矿区豆荚状铬铁矿中刚玉及其包裹体

a.刚玉及其Ti-N、Ti-B包裹体的二次电子图；b.刚玉及其Ti-N包裹体的二次电子图；c, d.刚玉及其Ti-C包裹体的二次电子图

Fig. 2. Corundum and its inclusions from the podiform chromitite in Kangjinla, Tibet

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图 3 康金拉铬铁矿区豆荚状铬铁矿中刚玉及其包裹体

a.刚玉及其Ti-C、Ti-Si-P包裹体的二次电子图；b.刚玉及其Ti-Si-P包裹体的二次电子图；c, d.刚玉及其Ti-C、Ti-Si-Fe包裹体的二次电子图

Fig. 3. Corundum and its inclusions from the podiform chromitite in Kangjinla, Tibet

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图 4 康金拉铬铁矿区豆荚状铬铁矿中刚玉Ti-C包裹体的二次电子图(a)与能谱面成分扫描图(b, c)

a.刚玉及其Ti-C包裹体的二次电子图；b.Ti元素的能谱面成分扫描图；c.C元素的能谱面成分扫描图

Fig. 4. Second image (a) and X-ray maps (b, c) showing Ti-C inclusion in the corundum from the podiform chromitite in Kangjinla, Tibet

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图 5 康金拉铬铁矿区豆荚状铬铁矿中刚玉的Ti-C包裹体的二次电子图(a)与能谱面成分扫描图(b~e)

a.刚玉及其Ti-C包裹体的二次电子图；b.C元素的能谱面成分扫描图；c.O元素的能谱面成分扫描图；d.Ti元素的能谱面成分扫描图；e.Si元素的能谱面成分扫描图

Fig. 5. Second image (a) and X-ray maps (b-e) showing Ti-C inclusion in the corundum from the podiform chromitite in Kangjinla, Tibet

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图 6 康金拉铬铁矿区豆荚状铬铁矿中刚玉的Ti-Si-P包裹体二次电子图(a)与线成分扫描图(b~f)

a.刚玉及其Ti-Si-P包裹体的二次电子图；b.Al元素的线成分扫描图；c.O元素的线成分扫描图；d.Ti元素的线成分扫描图；e.Si元素的线成分扫描图；f.P元素的线成分扫描图

Fig. 6. Second image (a) and line scanning graphs (b-f) of Ti-Si-P inclusion in the corundum from the podiform chromitite in Kangjinla, Tibet

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图 7 康金拉铬铁矿区豆荚状铬铁矿中刚玉的Ti-Si-P包裹体二次电子图(a)与能谱面成分扫描图(b~f)

a.刚玉及其Ti-Si-P包裹体的二次电子图；b.Al元素的面成分扫描图；c.O元素的面成分扫描图；d.Ti元素的面成分扫描图；e.Si元素的面成分扫描图；f.P元素的面成分扫描图

Fig. 7. Second image (a) and X-ray maps (b-f) showing Ti-Si-P inclusion in the corundum from the podiform chromitite in Kangjinla, Tibet

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图 8 康金拉铬铁矿区豆荚状铬铁矿中刚玉的Ti-Si-Fe包裹体二次电子图(a)与线成分扫描图(b~i)

a.刚玉及其Ti-Si-Fe包裹体的二次电子图；b.Al元素的线成分扫描图；c.O元素的线成分扫描图；d.Ti元素的线成分扫描图；e.Si元素的线成分扫描图；f.P元素的线成分扫描图；g.Fe元素的线成分扫描图；h.Cr元素的线成分扫描图；i.V元素的线成分扫描图

Fig. 8. Second image (a) and line scanning graphs (b-i) of Ti-Si-Fe inclusion in the corundum from the podiform chromitite in Kangjinla, Tibet

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图 9 康金拉铬铁矿区豆荚状铬铁矿中刚玉的Ti-Si-Fe包裹体二次电子图(a)与能谱面成分扫描图(b~i)

a.刚玉及其Ti-Si-Fe包裹体的二次电子图；b.Al元素的能谱面成分扫描图；c.O元素的能谱面成分扫描图；d.C元素的能谱面成分扫描图；e.Ti元素的能谱面成分扫描图；f.Si元素的能谱面成分扫描图；g.P元素的能谱面成分扫描图；h.Fe元素的能谱面成分扫描图；i.Cr元素的能谱面成分扫描图

Fig. 9. Second image (a) and X-ray maps (b-i) showing Ti-Si-Fe inclusion in the corundum from the podiform chromitite in Kangjinla, Tibet

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表 1 康金拉铬铁矿区豆荚状铬铁矿石中刚玉含Ti合金包裹体化学成分(%)

Table 1. Chemical compositions of titanium-bearing alloy inclusions in corundum from the podiform chromitite in Kangjinla, Tibet

样品号	Fe	P	N	Cr	Zr	Si	Ti	B	V	C	Mn	合计
KCr-13-1-1.2	0.00	0.02	20.30	0.02	0.00	0.00	75.69	0.00	0.54	0.00	0.00	96.57
KCr-13-1-1.3	0.02	0.00	0.00	0.00	0.08	0.00	68.66	29.55	0.00	0.00	0.03	98.33
KCr-13-1-3.2	0.00	0.00	17.74	0.03	0.08	0.02	75.69	0.00	0.49	1.32	0.00	95.37
KCr-13-1-5.2	0.43	2.25	2.08	0.57	0.38	37.87	44.25	0.33	0.71	5.70	0.16	94.73
KCr-13-1-5.3	0.96	6.79	4.43	1.53	0.16	18.45	61.27	0.00	1.49	2.98	0.31	98.36
KCr-13-1-5.4	1.23	8.43	3.59	0.62	0.47	23.01	58.96	0.22	0.81	2.88	0.24	100.46
KCr-13-1-5.5	-	-	-	-	-	-	78.29	-	-	21.71	-	100.00
KCr-13-2-2.2	-	-	-	-	-	-	84.33	-	-	15.67	-	100.00
KCr-13-2-2.3	-	-	-	-	-	-	82.24	-	-	17.76	-	100.00
KCr-13-2-2.4	-	-	-	-	-	-	85.05	-	-	14.95	-	100.00
KCr-13-2-2.5	-	-	-	-	-	-	85.37	-	-	14.63	-	100.00
KCr-13-3-1.4	-	-	-	-	-	-	87.49	-	-	12.51	-	100.00
KCr-13-3-1.5	-	-	-	-	-	-	82.87	-	-	17.13	-	100.00
KCr-13-3-1.6	-	-	-	-	-	-	77.90	-	-	22.10	-	100.00
KCr-13-3-1.7	28.00	0.94	0.00	2.95	0.00	38.43	29.38	0.00	1.32	0.00	1.31	102.33
KCr-13-3-1.8	0.00	0.27	0.00	1.24	0.00	55.23	43.15	0.00	2.25	0.00	0.00	102.14
KCr-13-3-1.9	29.77	0.85	0.00	2.46	0.00	37.45	29.85	0.00	0.89	0.00	1.35	102.63
注：合计数为100的是归一化的能谱数据；“-”未探测；其他数据为电子探针数据.

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表 2 康金拉铬铁矿区豆荚状铬铁矿石中刚玉含Ti氧化物包裹体化学成分(%)

Table 2. Chemical compositions of titanium-bearing oxide inclusions in corundum from the podiform chromitite in Kangjinla, Tibet

样品号	Al₂O₃	ZrO₂	TiO₂	合计
KCr-13-3-1.2	18.91	27.97	53.35	100.23
KCr-13-3-1.3	18.61	24.33	57.34	100.28

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